MT-2017 Protective Function Analog Multimeter

MT-2017 Protective Function Analog Multimeter

User’s Manual

1st Edition

, 2020

© 2020 Copyright by Prokit’s Industries Co., Ltd.

1

INTRODUCTION

This Multi-meter is an accurate, safe handheld meter that comes with robust protective holster alongside, built-in stand and hook-up design. MT-2017 is powered by batteries, offers accurate, reliable measurement of DC/AC Voltage, +/-DCV, DC Current, Resistance and Diode, LED, Transistor, Decibels, Continuity test and Capacitance with very high sensitivity quality movement. This meter is designed with double-sided glass-epoxy PCB, full overload & misused protection via two Fuses, voltage Suppressor & Diodes, as well as mirrored Aluminum dial plate. Ideal for indoor use in the laboratory, school, workshop, hobby and home applications.

SPECIFICATION

Safety Category: IEC61010-1, CAT II 1000V, CAT III 500V and

Pollution Degree 2.

Common Environment: 23C5C, less than 75% RH.

Operating temperature: 0C to 40C, 32 F to 104 F

Storage temperature: -10 C to 50C, 14 F to 122F

Operating Humidity Scope: less than 90% RH.

Storage Humidity Scope: less than 80% RH.

Dimensione: 171(W) x 108(D) x 37(H) MM

Weight: 370g approx. (including batteries 3pcs)

Accessories: One pair of test leads;

Two Spare Fuses: 0.5A/250V & 10A/250V, Φ5x20mm

Test

Functions Range Accuracy Remarks

DC V 0-0.1-2.5-10-50-250 V-1000V

3% FSD. 4% FSD. For 1000V

Input Impedance: 20KΩ /V Overload Protection: Max. 1000V AC/DC BUT 0.1V/2.5V/10V 250V Max.

Null DCV ±-5V, ±25V 5% FSD. Input Impedance: 40KΩ /V Overload 1000V Max.

AC V 0-10-50-250V -1000V

4% FSD. 5% FSD.

Input Impedance: 9KΩ /V Overload

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For 1000V Protection: Max. 1000V AC/DC But 10V/50V only 250V Max. Band width: 40 ~10K Hz

DC mA 0-0.05-2.5-25-250 mA, 10A

3% FSD. 4% FSD. For 10A

Drop Voltage: 250 mV Overload protected by Fuses 0.5A/250V & 10A / 250V at 10A range, Max. test time 15sec. for 10A.

Ω X 1: 0.2 ~ 2KΩ Midscale at 20Ω X 10: 2 ~ 20KΩ Midscale at 200Ω X 100: 20 ~ 200KΩ Midscale at 2000Ω X1K: 200~ 2MΩ Midscale at 0KΩ X10K: 2K ~20MΩ Midscale at 200KΩ

4% of ARC of Scale Length

Overload protected by the voltage Suppressor & Fuse <250V AC/DC (5s).

Capacitance (uF)

C: 2,000uF Max. .

Approx. Value

Use the R x 1K range

BATT Check 0 ~ 1.5V: GOOD - ? – BAD 0 ~ 9V: GOOD - ? – BAD

5% of ARC of Scale Length

Load Current: 270mA for 1.5V 25mA for 9V Overload protected by Fuse & voltage Suppressor <250V AC/DC(5s).

Transistor Check

hFE: 0-1000 via special hFE socket

Approx. Value

At Ω X 10 Range

LED, Diode Check

via special hFE socket

Approx. Value

At Ω X 10 Range

Decibel -22 dB ~ + 62 dB (0dB=1mW

Approx. Value

At ACV ranges Via Test Leads

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at 600Ω )

Continuity Check

Beeper sounding under 200 Ohm

Overload protected by Fuse & voltage Suppressor <250V AC/DC(5s).

POWER Source

Internal Battery: R3P, AAA, 1.5V 2pcs, 6F22, NEDA1604, 9V 1pc

CALIBRATION Ohms Zero Adjustor located at the right side of the panel. Adjust the meter pointer to the Zero mark on the right side of Ohm scale of the meter dial when the test leads are touched together. Mechanical Adjustor Screw: located right side below the center of the meter dial to set pointer to Zero mark at the left side of the scale. (-) Jack: Plug-in connector at the lower left on the panel for black, negative test lead. (+) Jack: Plug-in connector at the lower right on the panel for Red, positive test lead.

STAND & HOOK-UP This meter can be used in any operating position. It has two rear support devices, i.e. the upper small bracket and the lower big tilt device. The upper one not only performs the light slanted position, but also hook-up the tester which makes it easier to place the tester and read the display when measuring. And the lower big tilt device can provide the steeper slant degree position easy for user’s reading too.

Hook-up

Upper Tilt

Device

Big Lower

Tilt Device

4

OPERATING INSTRUCTIONS

CAUTION!

When making voltage or current measurements, develop the

habit of turning off all power to the circuit under test. Connect the

test leads at the desired points in the circuit, and then turn on

the power while taking readings. Turn off the power before

disconnecting the test leads from the circuit.

INTERNAL BATTERY CHECK

To check the battery condition, insert the black test lead into the

(-) jack. Set the range switch to the R X1 range position and

short the ends of the two sides of the test leads. If the pointer

can not be brought to the zero mark, replace the 1.5V cells or 9V

cell. (See battery replacement.)

BEFORE OPERATING

1. Set the range switch to the proper position before making any

measurement.

2. Never apply more voltage or current than the rated value in

every position.

3. When the voltage or current to be measured it not known,

always start with the highest range.

4. If meter indication is in the lower half of the scale and falls

within the range of a lower scale, reset selector switch to the

lower range for greatest accuracy.

5. If the meter won’t work at all, check the fuse located on the

PCB. If it’s blown, replace it. (See fuse replacement.)

6. Avoid placing the meter where extreme shock or continuous

vibration is encountered and do not store in excessively hot or

damp places. Although very rugged, the meter is a sensitive

measuring device and should be handled carefully & properly.

7. Do not check resistance, transistor, diode, LED, or

capacitance when live voltage or current input across the

circuit.

8. When the meter is not in use, keep the selector switch to the

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“OFF” range position, this provides direct short across meter

movement for minimum needle bounce when transporting

meter.

9. If you should accidentally apply excessive voltage or current

on a certain range, disconnect the leads from the circuit as

quickly as possible, check instrument operation on that range

by applying peoper input. If the meter does not operate

properly, check fuse. If it is blown replace it. (See fuse

replacement.)

OPERATION PROCEDURES

DC Voltage Measurement

WARNING: USE EXTREME CARE WHEN MAKING

MEASUREMENTS FOR HIGH VOLTAGE. DO NOT TOUCH

TERMINAL OR PROBE ENDS.

1. Set the selector switch to the appropriate DCV range to be

used.

2. Connect the BLACK test lead to the “-COM” jack and the RED

test lead to the “+” jack.

3. If you know the polarity of the circuit to be tested, connect the

black probe to the negative side.

4. If you don’t know the polarity, connect the probes to opposite

sides of the circuit and watch the pointer. If it goes to the left,

reverse the probes. The RED probe will be connected to the

positive.

5. Check the needle position and the get the reading on V.A scale.

Null DCV (Central Zero) Measurement

At these two ranges, it can automatically judge the polarity of

circuit as the pointer can move to the center line and become a

Null meter.

1. Set the selector switch to the DCV ±5V or 25V range.


test lead to the Red “+” jack.

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3. Set the Zero Ω adjustor to place the pointer exactly to the

Central Zero position if need.

4. Connect the test leads across the circuit or load under

measurement.

5. Take the readings on the Red dial Null DCV scale.

NOTE: If the needle failed to be set at Central Zero position, the

power of 9V battery may be weak and should be replaced by

new one for normal working.

AC Voltage Measurement

WARNING: USE EXTREME CARE WHEN MAKING

MEASUREMENTS FOR HIGH VOLTAGE. DO NOT TOUCH

TERMINAL OR PROBE ENDS!

1. Set the selector switch to the appropriate ACV range to be used

and connect the test leads across the circuit or load under

measurement. (Polarity of the test probes is unimportant on ACV

test.)


test lead to the“+” jack.


DC Current Measurement

WARNING: DO NOT APPLY VOLTAGE TO MEASURING

TERMINAL WHILE RANGE SWITCH IS IN CURRENT POSITION.

DO NOT ATTEMPT TO MEASURE AC CURRENT.

1. Set the selector switch to the appropriate DC mA range to be

used and connect the test leads in series with the circuit or the

load under measurement. If the pointer deflects to the left,

reverse the probes.


test lead to the Red “+” jack for Current at/less than 0.25A. For

large current max. 10A, move the red test lead to the Red “10A”

jack.

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Note:

Excessive current input across mA range will blow the fuse

that must be replaced by a same fuse rating 0.5A/250V or

10A/250V. The max. testing time once must be not more than

15sec. and pause 5min. for next time at big current load.

The Maximum terminal voltage drop is 250mV except for the

10A range.

Note: If connected incorrectly with the voltage at these ranges,

quickly remove the test leads from the circuit as to avoid

damage to this tester.

(This tester can afford the voltage <250V DC/AC rms. for the

period of 5 seconds max.)

Resistance Measurement


TERMINAL WHILE RANGE SWITCH IS IN OHM POSITION.

1. Set the selector switch to the appropriate Ω range to be used.



3. Short the leads by touching the probes together. Pointer should

read zero at the right hand end of the upper most scale, if it

doesn’t, use the Ohm adjust knob on the right hand of the panel

to line up the pointer with zero. (If pointer can’t be brought to

zero, replace battery.)

4. Connect the test leads across the resistance to be measured.

5. Take reading on the top “Ω” scale and multiply it by the

multiplication factor indicated by the selector switch.

6. If there is little or no pointer movement from the left side of the

scale, reset the selector switch to higher range. The effective

reading scope on an Ohm meter scale is within the area of

between 25 degree of Arc left side to the Midscale and 25

degree right side to the Midscale.

Note: If connected incorrectly with the voltage, quickly remove

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the test leads from the circuit as to avoid damage to this tester.



Diode Measurement

1. Set the selector switch to the appropriate Ω range to be used.

NOTE: To test the diode while current below 0.060 mA at X 10K

range; current below 0.15 mA at X 1K range; current below 1.5

mA at X 100 range; current below 15 mA at X 10 range; current

below 150 mA at X 1 range.

2. For IF (forward current) test, put the BLACK test lead to the

“-COM” jack and the RED test lead to the Red “+” jack. And then

connect the Black probe to the Positive terminal of the Diode,

the Red probe to the Negative terminal of the Diode.

For IR (reverse current) test, reverse the connection.

3. Read the value IF or IR of the diode on the LI scale.

4. Read the linear (forward voltage) VF of the diode on the LV

scale.

Continuity Test


TERMINAL WHILE RANGE SWITCH IS IN OHM POSITION.

Set the selector switch to the BUZZ range. Connect the test leads

to two points of circuit. If the resistance is lower than 200 Ohm

approx., the Beeper sounds.

Note: Battery voltage is sufficient for Buzzer operation as long as

the Zero Ohm pointer can be adjusted to the Zero scale place.


the test leads from the circuit as to avoid damage to this

tester..



9

Transistor hFE and LED Test

1. Set the selector switch to the R X 10 range.

FOR Measuring Transistor hFE

2. Take note the type of transistor “PNP” or “NPN” and then insert

the transistor terminals of the Emitter, Base and Collector

separately into the proper holes of the socket on the front panel.

3. Read the approximate hFE Value directly at the hFE scale.

Note: Current 10μA. VCE 2.8V.

4. When the Base terminal cut, the value of Leak is Iceo for

Transistor.

FOR Measuring LED: Insert the transistor terminals directly into

the “+” and “-” holes of the socket on the front panel.

And then check if the LED under testing is lighting.

Battery Check

1. This meter comes with two separate battery check ranges to test

either DC 1.5V or 9V batteries.

2. Set the selector switch to the appropriate BATT range to be

used.



4. Connect the Red test lead to the positive end of battery and the

Black one to the negative end of the battery to be measured.

5. Take reading on the “BATT” scale and check it good or bad as

per which portion indicated.

(Note: the mark section of “?” shows that the battery may be

starting to decay.)


the test leads from the circuit and can avoid the damage to

this tester.



10

Decibels Measurement

1. Set the selector switch to AC 10V range.



3. Connect the test leads to the measuring circuit specially in

series with a 0.047μF/400V Metalized Polyester Capacitor.

And then read the bottom Red dB scale.

4. For more dB scope, change the selector switch to the others

of ACV ranges and make the same actions. Add the

appropriate number of dB scale reading as noted on the chart

below.

NOTE: For absolute dB measurements, circuit impedance

must be 600 Ohm. 0 dB = 1mw dissipated in a 600 Ohm

impedance (equivalent to 0.755V across 600 Ohm)

ACV RANGE ADD dB Number

50 14

250 28

1000 40

Capacitance Measurement


TERMINAL WHILE MAKING ANY CAPACITANCE

MEASUREMENTS.

BEFORE TESTING ANY CAPACITORS, DISCHARGE THE

CAPACITOR COMPLETELY.

1) Set the selector switch to the C (R X1K) range.

2) Connect the BLACK test lead to the “-COM” jack and the

RED test lead to the Red “+” jack.

3) Connect the test leads to the capacitor to be measured

(Note the polarity of capacitor).

4) Watch the needle deflection to the right topside, and read

the Red C2000uF scale on the Dial.

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TROUBLESHOOTING

Nevertheless, problems or malfunctions may occur.

For this reason, the following is a description of how you can

eliminate possible malfunctions yourself:

Error Possible cause

The multimeter does

not work.

Are the batteries exhausted?

Check the state of the batteries and

the fuse 0.5A.

No measurements

possible via V/mA

socket.

Is the fuse defective? Check the fuse

0.5A (fuse replacement)

No measurements

possible via 10A

socket.

Is the fuse defective? Check the fuse

10A (fuse replacement)

No change in

measured values.

Have you selected the right

measuring sockets? Is the measuring

range/mode correct (AC/DC)?

Faulty measuring

results are displayed.

Has null balancing of the display or a

0 Ohm calibration for the resistance

measurement been carried out? Is

the batteries not properly assembled

in?

12

MAINTENANCE

Replacement for Battery and/or Fuse should only be done

after the test leads have been disconnected and POWER OFF.

1. Battery Replacement

- 1.5V Battery (Pls. see the Picture below for reference)

1). This tester uses 2pcs AAA size 1.5V batteries which are

located under the lower battery cover together with the big

tilt device on the lower part of the rear case.

2).Note the condition of the batteries using the procedure

described above, if the battery needs to be replaced, turn

the lock by 180°degree and take off the cover of the battery

cabinet together with the big tilt device on the rear case.

3). Remove the spent batteries and replace them with a battery

of the same type. Observing polarity as indicated battery

polarity marking on the bottom of the battery compartments.

4). Replace the battery cover and turn the lock by 180°degree

again to tighten the battery cover.

- 9V Battery (Pls. see the Picture below for reference)

1). This tester uses One 9V battery which is located under the

upper battery cover together with the tilt-Hookup device on

the upper part of the rear case.

2).Note the condition of the battery using the procedure

described above, if the battery needs to be replaced, remove

the screw and open the upper cover of the battery cabinet

on the rear case.

3). Take off the spent 9V battery and replace them with a battery

of the same type. Observing polarity as indicated battery

polarity marking on the bottom of the battery compartment.

4). Replace the battery cabinet cover and tighten the screw.

2. Fuse Replacement(Pls. see the Picture below for reference)

1). When the fuse needs replacement, use only UL-Listed

0.5A/250V fuse or 10A/250V fuse identical in physical size to

the original type Φ5 x 20 mm.

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2). Open the big lower tilt device on the rear case and then turn

the lock by 180°degree and take off the cover of the battery

cabinet together with the big tilt device.

3). The old fuses inside their holders located on the PCB can be

visible and access to be removed. Then take off the melt

fuses and install the new fuses into their original places.

The 0.5A/250V fuse is at the left side and 10A/250V fuse at

the right side.

4). Replace the battery cover and turn the lock by 180°degree

again to tighten the lower battery cover.

NOTE: 2pcs stand-by fuses are provided and located beside the

batteries under the lower battery cover with rating marked below

the fuses.

Lock for lower 1.5V

Battery Cover Lower 1.5V Battery Cabinet

inside and Fuses Layout

Screw

Hole

9V Battery

Documents

MT-2017 Protective Function Analog Multimeter